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Q.

Is it true that adding alum to water to hasten sedimentation is called loading?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
Loading is the method to expedite the sedimentation of finer particles of impurities. For loading, alum is added. It is done to remove small particles like clay which are present in the colloidal state. Alum neutralises the negatively charged clay particles, which coagulate at the tank's bottom. The suspended particles from water are removed by the sedimentation process where water is allowed to stand, and the suspended impurities settle down at the bottom of the tank. So, adding alum to water hastens sedimentation.
 
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